The athlete can use the strength of the front supporting leg to come back up

At no stage is there potential for the shear force to affect the rear knee unless the athlete trains to failure

If I asked you to think about the movement in its entirety and focus on the coming back up part from the forward lunge. You need to press your front foot explosively into the ground to come back intro neutral standing position. Explosive is the keyword. In-place forward lunges are to work explosiveness. These lunges are always programmed in high volume considering all reps performed in the WOD, with high volume and added weight, one can’t remain explosive. Several things start happening, sliding the front foot back in place, or starting to put weight on the back knee, creating shear forces. Knee pain much?